Safety device for heaters.



No. 867,355. PATENTED OCT. 1, 1907. I. FILSON.

SAFETY DEVICE FOR HEATERS.

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' Witness PATENTED OGT. l, 1907.

' v I. FILSON.

SAFETY DEVICE FOR HEATERS.

APPLICATION FILED MAY 28. 1906.

6 SHEETS-SHEET 2.

' -%T J w THE NORRIS PETER: co, WASHINGTON, n z:

No. 867,355. PATENTED OCT. 1, 190v. 1. FILSON.

SAFETY DEVICE FOR HEATERS.

APPLICATION FILED my 2a. 1906.

6 SHEETS-SHEET 3.

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1w: owns PETERS 41., WASHINGTON, a c

PATENTED OCT. 1, 1907.

I. PILSON. SAFETY DEVICE FOR HEATERS.

APPLIOATION FILED MAY 28, 1906.

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galvanic;

Witnesses I arm,

1n: nouns PITERS co. WASHINGTON. p. c.

No. 867,355. PATENTED 00w. 1, 1907.

. I. FILSON.

SAFETY DEVICE FOR HEATERS.

APPLICATION FILED MAY 28 1906.

6 SHEETS-SHEET 5.

Svwewtoz F a RZSorg witnesses mat-MW, Z Q I flmw ms NORRIS PETERS 1:17.,WASHINGTON. n, c

No. 867,355.. PATENTED OCT. 1, 1907. I. FILSON.

SAFETY DEVICE FOR HEATERS.

' APPLICATION FILED MAY 26. 1906.

6 SHEETS-SHEET 6.

gave/Mot lifl/ 1 018020, witnaaaeo v THE namus PETERS cm, WASHINGTON, 04c4 OFFICE.

IRA FILSON, OF SPRINGFIELD, OHIO.

SAFETY DEVICE FOR HEATERS.

Specification of Letters Patent.

Patented Oct. 1, 1907.

Application filed May 28, 1906. Serial No. 319,129.

To all whom it may concern:

Be it known that I, IRA FILsON, a citizen of the United States, residingat Springfield, in the county of Clark and State of Ohio, have inventedcertain new and useful Improvements in Safety Devices for Heaters, ofwhich the following is a specification, reference being had therein tothe accompanying drawings.

This invention relates to safety devices for heaters, and is designedmore particularly for use in connection with heaters using gas as afuel. Natural gas is very largely used for this purpose, and isfrequently subject to great variations in pressure, which sometimesextinguish the fires when the pressure falls, causing danger ofasphyxiation and explosion when the pressure again rises, and whichsometimes cause overheating, with its attendant dangers of fire, whenthe pressure rises too high.

It is the object of my present invention to provide a safety device foruse in connection with a gas heater which will serve, in its most highlydeveloped form, to not only give a warning signal, but also positivelyshut off the supply of gas, in case the temperature of the heater risesabove or falls below certain predetermined but adjustable limits.

To these ends my invention consists'in certain novel features which Iwill now proceed to describe, and will then particularly point out inthe claims. 7

In the accompanying drawings, Figure 1 is a'perspcctivc view of anappartaus embodying my invention in one form; Fig. 2 is a detail frontelevation of the shutoff mechanism; Fig. 3 is a side elevation of thesame, partly in vertical section; Fig. 4 is a detail top plan view ofthe shifting lever which operates the shifting valve; Fig. 5 is a sideelevation of the thermostat and its associated parts; Fig. 6 is a frontelevation of the same; Fig. 7 is an enlarged detail sectional view,taken on the line :0 no of Fig. 6 and looking in the direction of thearrows; Fig. 8 is a plan section, taken on the line y y of Fig. 7 andlooking in the direction of the arrows; Fig. 9 is a detail sectionalview, taken on the line 2 2 of Fig. 8 and looking in the direction ofthe arrows; Fig. 10 is a diagrammatic view illustrating the electriccircuits of the apparatus; and Fig. 11 is a detail view of amodification.

In the said drawings, in which I have shown an apparatus embodying myinvention in its preferred form, 1 indicates the main gas-supply pipe ofa house, the same being provided with a shut-off valve or'stop-cock 2,of any approved form, that shown being a well known form of plug valvecomprising a casing 3, and a plug valve 4 rotatable therein to open orclose the pipe 1 and thereby control the flow of gas through said pipe.In the present instance, the arrangement is such that the valve is openand the gas can flow through said pipe when the parts are in theposition shown in full lines in Figs. 1, 2 and 3, while the valve isclosed and the flow is stopped or diminshed when the parts are in one orthe other of thetwo positions shown in dotted lines in Fig. 2 of thedrawings. To effect the positive movement of this valve, the stem 5thereof has secured to it by a screw bolt 6 a cross head 7, comprising abody 8, and parallel plates 9 arising above the body and connected by apivot bolt 10. On this bolt is pivoted the lower end of a lever 11, theupper end of which consists of an enlarged head to give weight to thesaid upper end, the same consisting preferably of heavy metallic blocksor plates 12 and 13, secured to the upper end of the lever 11 andsomewhat offset with respect to said lever and each other. These offsetsprovide recesses or spaces for springs 14 and 15, which serve not onlyas detents to holdthe lever 11 normally in upright position, but also asimpulse springs to give to said lever a primary impulse or start fromits normal upright position either to the right or to the left,according to the requirements of the apparatus The spring 14 is securedon the inner face of the plate 12 by means of a screw bolt 16, whichsecures the lower end of said springto said plate. The upper end of thespring 14 is bent to form an inclined guard 17, which is adapted toengage the armature hereinafter referred to and permit the spring topass the armature in one direction without injury of the parts. Thespring 1.5 is similarly secured at its lower end to the inner face ofthe plate 13 by means of a screw bolt 18, and the upper end of saidspring 15 is formed into an inclined guard 19 similar to the inclinedguard 17 of the spring 14.

Cooperating with thesprings 14 and 15 are two elec tromagnets 20 and 21.These magnets are supported on a shelf 22, which latter may beconveniently held in position by brackets 23, secured to the pipe 1 byclips 24. These electromagnets may be secured to the shelf 22 in anysuitable manner, the construction which I have shown for this purposecomprising upwardly extending screw bolts 25, secured at their lowerends to the shelf 22, one pair of screw bolts for each magnet, the base26 of which has the supporting pair of screw bolts passed upward throughits ends, and nuts 27 being provided above and below said base to effecta vertical adjustment of the magnet. Said magnets extend down throughthe shelf 22 and have their poles projecting downward below the same,the pole 28 of the magnet 20 being immediately above the path of thespring 14, while the pole 29 of the magnet 21 lies above the path of thespring 15.

30 indicates an armature for the magnet 20, consisting preferably of aspring of magnetic material, having one end secured to the under side ofthe shelf 22 by a screw 31, its other end lying below the pole 28 of themagnet 20 and terminating in a lip or flange 32, which is adapted to thesheli 22 at 34 and having its free end located below the pole 29 of themagnet 21 and provided with a lip or flange 35 to engage the upper endof the spring 15.

From an examination of Fig. 2 of the drawings, it will be seen that whenthe parts are in the position shown in lull lines, the cross head 7 ishorizontal, the shifting lever 11 vertical, and the parts are held inthis position by the engagement of the springs 14 and 15 with thearmatures 30 and 33, said armatures engaging said springs on oppositesides so as to prevent movement of the upper end of the lever 11 ineither direction, the springs being, however, bent and under tensionwhen thus engaged. Assuming that the magnet 20 is energized, thearmature 30 will be drawn up into contact with the pole piece thereof,thereby disengaging said armature lrom the spring 17 This leaves thelever 11 free to fall towards the lelt of Fig. 2, it being preventedirom falling toward the right by the engagement of the spring 15 wth thearmature 33, which engagement is still maintained. The lever ll beingvertical, some active force is required to start its iall, and, in thepresent instance, where the magnet 20 is assumed to be energized andarmature 30 and spring 14 to be disengaged, it is the bent or tensionedspring 15 which-is still in engagement with the armature 33 that givesthe initial impulse to the lever 11 by moving its upper end over towardthe leftin. Fig. 2 as soon as the spring 14 and armature 30 aredisengaged and permit such movement. After the lever 11 has started toall its velocity increases rapidly, of course, and said lever strikes anabutment 36 on the cross head 7 to the lel't of the pivot 37 of theshitting lever, its impact being rendered greater by reason of theweight of its upper end, The cross head 7, thus struck by the weight ofthe lever, turns with the same and thereby closes the shut-off valve 2.When the magnet 21 is energized and the armature 33 disengaged irom thespring 15, the spring 1.4 gives the initial impulse to displace thelever 11, and said lever falls to the right of Fig. 2, striking againstan abutment 38, which, when the parts are in normal position, liessomewhat lower than the abutment 36, thus permitting the lever 11 tomove through a larger portion of its arc of movement before it strikesthe abutment and begins tomove the cross head along with it. The totalmovement of the lever 11 being the same, in the construction shown,whether it falls to the right or to the left, the range of movement ofthe cross head is less when the lever falls to the right, owing to thedifference in position ofthe abutments 36 and 38. The construction issuch that the tall oi the lever to the right does not entirely close thestop-cock and cut oil the How, but acts to partially close saidstop-cock and diminish the flow. The particular construction illustratedby which this result is obtained is designed for use with an ordinarystop-cock, having its ports symmetrically arranged, so that movement toan equal extent in either direction from the normal position will alwaysproduce the same result in diminishing or cutting off the flow. Ofcourse, by the use oi a specially designed valve or stop-cock, theparticular means just described for varying the amount of movement ofthe cross head and valve according as the lever falls in one directionor the other may be dispensed with.

The electromagnets 20 and 21 are controlled by a thermostat shown inFig. l and illustrated in detail in Figs. 5 to 9 ol' the drawings,inclusivev 3!] indi cates a gas stove or other gas heater. having astove pipe 40 for the escape of the products ol' combustion. a sectionol which is shown in Figs. 5, ti and T thc same being employed for thesupport of the thermostat just relerred to. This thermostat comprises alever 41, pivoted at 42 to the interior oi the stove pipe section, andextending across said interior and out through vertical slot 43 in thesame. The movements of this lever are controlled by an expansion bar 44,pivoted at its upper end to the lever 41. as indicated at 45. The lowerend oi said expansion bar is provided'with a nut 45, mounted on athreaded shai't l7 which is swiveled in the pipe 40 and provided with athumb piece 48 by means of which said screw shalt may be turned. ing oithe bar 44 by reason of changes ol' temperature in the pipe 40 cause anupward and downward movement of the free projecting end ol the lever ll.and the range of this movement is controlled by the screw shaft 47,rotation of which gives to the projecting end of the lever 41 an initialposition which is either higher or lower with respect to the contactpieces hereinafter referred to, according to the direction in which theshaft 47 is turned.

Provision is made for indicating visually the position to which thelever 41 is set by the mechanism just described. To protect themechanism employed ior this purpose and also the contacts whichcooperate with the lever 41, there is secured to the pipe it) a box orhousing 49, having on its l'ront lace. as shown in Fig. (5, a dial 50,with suitable indicating tigurcs thereon, the box having a hinged top orcover 5]. secured by a catch 52, said hinged cover giving acccss to theinterior oi the box. The dial 50 has cooperating with it an index orpointer 53. secured to the iront end of a shaft 54, said end projectingoutward beyond the front 01' the box to receive said index or pointeroutside of the same. The shalt 5-1 is supported in a bracket 55 withinthe box, and has mounted on it a pinion 56, with which meshes a gcarsegment 57, pivoted at 58 in the bracket To this gear segment there ispivoted at 59 the lower end of a link 60, the upper end of which ispivoted at t3] to the free end of a lever (32, pivoted at its other end,as indicated at 63, to a bracket (54. The lever (52 is engaged by theforward end of the lever ll, the collnection being preferably thatshown. in which the lever (52 is provided with a slot (55. through whichthe lever 41. passes and slides, the lever ()2 having a pin (56 whichextends across the slot (55 and passes through a slot (37 formedlongitudinally in the lever -11. by reason oi the connection justdescribed, turning the thumb piece 48 to shift the position of the leverit The lengthening and shortcu- 'will correspondingly turn the index orpointer 53 and thereby move said pointer to conform to the initialposition of the lever 4i. The contacts hereinbct'ore rel'erred to,indicated respectively by the relcrcncc numerals (1'8 and G9, arearranged respectively above and below the lever 4-1. in the paththereof, and it will be seen that it the lever be set to any givenposition, the precise increment of heat which will cause it to risesufliciently to touch the upper contact l8 may be readily determined.and the scale ol tigurcs on the dial may be so arranged that for anygiven I position oi the index 53, the figure to which said index pointswill indicate the temperature at which the lever 41 will be raised to aposition such as to strike the contact 68. l t will be understood that.when the device is in actual operation, the lever 41 will always be soadjusted that upon a decrease in temperature in the pipe 40 such asfollows the extinction of the flame of burning gas in the stove orheater, the contraction of the bar 44 will draw the lever 41 down so asto cause it to bear upon the contact 69. When the device is not in usethe lever may be readily adjusted by means of the screw shaft 47 so asto remain fixed'in a position between the two contacts and out ofcontact with both of them.

In Fig. 11 I have shown a modification of the connection between theexpansion bar and contact lever, the former being indicated in thisinstance by the reference numeral 70, and the latter by the referencenumeral 71. In this construction, an intermediate lever 72 is employed,pivoted at 73 to the pipe 40 and having the upper end of the expansionbar 70 pivoted to it at a point 74 near its own pivotal point 73. Thelever 72 is pivotally and slidingly connected tothe contact lever 71 atits free end, as indicated at 75, and the distance between the pivots 74and 75 is greater than the distance between the pivots 73 and 74, sothat the expansion of the bar 70 results in a correspondingly increasedrange of movement of the contact lever 71, thereby rendering the lattermore sensitive to the variations of the length of the expansion bar thanin the case of the direct connection such as is illustrated in Fig. 7.

The contacts 68 and G9 are mounted on an insulating block 76, eachcontact having a base portion 77 at right angles to its body portion,through which base portion passes an adjusting and clamping screw 78 andout through the wall of the box 49, its outer end receiving a thumb nut79, which bears against the outer wall of the box. Each contact has anangularly arranged extension 80 of its base, which forms a convenientmeans for swinging the contact around the screw 78 as a pivot when thenut 79 is loosened. By this means the contacts 68 and 69 may beindependently adjusted up and down relatively to the contact lever 41,thus forming an alternative means of adjustment of the contacts to thedesired temperature, and one which may be employed to bring the actualcontact into conformity with the indications of the pointer and dial incase of disarrangement of the device.

The lever 41 is connected to one terminal of a battery or other suitablesource of electrical energy 81, the connection being shown as effectedby means of a Wire 82. .The contact 68 is connected with the coil of theelectromagnet by a wire 83, while the contact 69 is connected with thecoil of the electromagnet 21 by a wire 84. The other ends of the magnetcoils are connected by branch wires 85 to a wire 86 which leads to theother terminal of the battery 8]., and a switch 87 is located in thisportion of the circuit, so as to make or break the same by hand. Thesecircuits are shown diagrammatically in Fig. 10 of the drawings. It willbe seen that when the temperature within the heater 39 and pipe falls asuflicient extent by reason of the extinguishing of the fire through thecessation in the flow of gas, the arm 44 will cool and contract, movingthe lever 41 downward into contact with the contact 69. This closes thecircuit which, starting from the battery, proceeds through the wire 82,lever 41, contact 69, wire 84, magnet 21, branch wire 85 and return wire86 to the battery. The magnet 21 thereby becomes energized, the armature33 is attracted and releases the lever 11, and the latter, being givenits initial impulse by the spring 14, falls to the left in Fig. 2 of thedrawings, and closes the stop-cock 2, thereby cutting off the flow ofgas. On the other hand, if by reason of an excessive flow of gas or someother cause the temperature rises too high in the heater 39 and its pipe40, the bar 44 will expand and move the lever 41 upward until it strikesthe contact 68, whereupon the circuit will be closed from battery 81through wire 82, lever 41, contact 68, wire 83, magnet 20, branch wire85 and return wire 86 to the battery. This closed circuit energizes themagnet 20, attracts the armature 30, releases the lever 11 on theopposite side, and permits the spring 15 to give it an initial impulsewhich causes it to fall to the right in Fig. 2 of the drawings, partlyclosing the stop-cock 2 and diminishing the flow of gas. The position ofthe fallen lever will indicate whether the gas supply was affectedbecause of failure of the gas supply or because of an excessivetemperature, so that steps may be taken to remedy the matter. Of course,by bringing the lever 11 upright and again engaging it with thearmatures 30 and 33, the stopcock 2 may be again opened to permittheflow of gas to the heater.

It is-deemed advisable to provide a signal or alarm which will beoperated whenever the temperature passes the limits prescribed for it,and for this purpose I prefer to employ a bell 88, connected with thebat tery 81 through the medium of a wire 89, joined to the wire 82. Thelever 11 is in electrical connection with the other terminal of thebattery through a wire 90, joined to the wire 86. Wires 91 and 92 leadfrom the bell to contacts 93 and 94 respectively, said contacts beingarranged on opposite sides of the pivotal axis of the lever, in aposition such that when the lever falls to the right of Fig. 2 it willcome into contact with the contact piece 93, and when the lever falls tothe left in said figure it will come into contact with the contact piece94. In the former case a circuit is established from battery 81, throughwire 82, wire 89, bell 88, wire 91, contact 93, lever 11 and wires 90and 86 back to the other terminal of the battery, the circuit thusclosed operating the hell or alarm 88. In the latter case, when thelever falls to the left, the circuit is established from the batterythrough Wire 82, wire 89, bell 88, wire 92, contact 94, lever 11, andwires 90 and 86 back to the other terminal of the battery, in which casethe bell or signal 88 is also actuated. The switch 87 may be used tostop the sounding of the signal b'ell after it has attracted attention,and for this purpose the bell and switch may be conveniently arranged inone part of the house, say, for instance, a bedroom in an upper story,while the heater may be located in the same room or another room, or inthe basement, and the balanced lever 11 and its controlling magnets maybe located in still anotherportion of the structure, these latter beingusually located in the basement or cellar, so that the stop-cock 2 maybe placed in the supply pipe at a point between the source oi supply-ggas and the. fi s imnch pipes within the house. Thalia, the i0- nntiunof the switch 87 in a convenient portion oi-thc house avoidu theneceoeity oi descending to the cellar to lift the lever ii for thepurpose oi breaking the circuit: at the contacts 93 and N. that some ofthe icnturcx'oi the construction just described are available in astructure where the iever 11 is not employed for the purpose ofautomatically closing the atop-cock, since it may be eecnthut thecloning of the signal circuits on an undue ri o or fall intemperaturewill notiiy'the occupants of the house and enable them toshut-off and regulate. the gas hyhand, if necessary.

i l have described an appnnitus embodying my invention in its most,highly developed form, comprising limth an automatic shut-oil and alarmuignnl. operative. upon either an excessive rise or full in tcmpeniture,and no constructed as to indicate alter its operation whether the sumowas due to a rice or in ii. full in tunipcmture. lint the invention, inits simpler ionnn, does not; require the embodiment oi all of thesefeatures, some of which may be omitted. For inntztnce nne oi the'twocontacts GS, (59, may be omitted, and the mechanism so organized as torespond only to an excessive rise or to an excessive full intemperature. It is also nppnrent that while it is desirable that thelever, l'iy milling in different directions when actunted by differcntcondition s, hould indicnte the cnune oi the i-rou hie, neverthclca, theuppumtus may be simplified by causing the lever to {all ulways in thesame direction,

whei-hernctunted by a rise or full in temperature, since the gun vvilllie shut. off and the signal nctuutcd in this case stir-.0. althoughlhelever would not, indicate the slctuatiug conditions.

.l wish it. to be understood thnt I do not desireto be limited to theexact details of construction nhown and described, for obviousmodificatione will occur to a person skill: d inthc art.

Having thus fully described my invention, what, 1 claim on new andde$irc to secure by Letters Patent,

1. A safety dcvicc for iicuters,-centprining n gnu nuppiy pipe, natop-cock ruutroillnr; snid pipe and having n laterallycnxicmhfl mm. it\vehzhled lever pivoted nenr said liiflll'cultk und'nl'r'mi'cml 'Iostrike buit'l urm when releused to operate nnld utup-cuclt, nuelectro-nmcnct having an nrmnturc which nctn when free to prevent thefull at unid lever. on elect ic i'lrctilt including suiti elerlronuignctand u neuron of electricity, mid n circuit-cloning device cuntrotllm;tho circuit and nctuntcd ivy the tempernture 0! th ln-nler,nuimtnntinllg; us Ill crlhcd.

L. A Mir-u tltu'icc t'or hen'r l4, comprlsim, n cus supply pipc. natop-cock nonuolllm: the sump, n normally upright lcvi-r il 'ililL tonpcrutn Milli Mop-cock by its [nil in elther.

direction when rnlchneil, two elcctroninzncts. the' rumiul'cn whcrcol'support liilltl lever on opposite nldcn, nn ilit'llit' circuit including.illlil elcctroningnctn, and n clrcull-cloning nrrn. (.unrnrts locntciion npptmitc sides of mild urm null clocrrlculh' connected with therespective nun,- nclx, and n theriumint controlled ll the roniperuturcoi the hunter and netting to more mild circuit-closing urn:

' ngnlnst. one or the other of'nnid cnntuctu ni the temperature eitherrlsca or bills. exccruhL-ly, uulmtnntlaiiy on dertt'llictl.

.i. in n safety device for llutlitlii, n rtup eoclr controlling the gassupply,, uml it normally Ulil'lLlllLltlVGi' acting to opcrnte unit?atop-cock by its fall in either direction when rlieiucd, in combination4 with. two elccironmuuetn, the nrmutureu whereof engage nod supportRilltl lever on oppo- It will be understood File silica, means forenergizing said eicctromagzncts upon an undue rise or all oftemperature, rcspcctlvely, and springs interposed between Hillll magnetsand armature-s,

'whcreby when one nrnlature releases the lever the spring which engagesthe other armature gives the lever an lnitlnl impulse, xuliutnntiully asdescribed. i

4. in a safety device for beaten, n gnu supp]; pipe, :1 stopcockcontrolling the same and provided with n Cl'O ir head, I. weighted'lever plvotally mounted on the crow head and ldapted to strike the namewhen it mm in eithedlrection, means for holding mid lever normally inuprlchi punli'lnn, and means for rclcuulm: fllllfl lever to cnune it to(all in one direction or the other upon on undue increase or decrease inthe temperature, nul-mnntlnlly as described.

fn'ln a mint device for hcutcnl. a Mop-cock, a non mnliy upright levercontrolling the. some and acting to opcrnie uuid slop-cock by its fullin either direc ion. two clectromnuuets, the :irmatures whereof supportfluid lever on opposite sides, an electric circuit including it sourceof electricity, 1! CliCUlbClO-Qlllt: arm, and branch circuits includingsaid clecrromnunets: nml coutncls on opposite aide!- of Rflld arm.- andu shunt circuit lnciudlm: the. lever. on rlinrm. and cuntncts urrungcdon opposite sides 0t said lever and electrically connected with saidnlnrrn, substnir tinlly us (h-scrllicd.

G. in it surely dc'rlce tor heaters, the combina ion, with the outletpipe or the heater, of 11 contact lever lmving one end extending intosaid pipe. 21 contact in the path 0! the outer end thereof. nud anexpansion 1m located in said pipe nnd connected with the inner end ofwill contact lever. substantially as described.

- in, a safety device for heaters, the combination, with the outlet pipeof the heater, 0! a contact lever having one end extended into snidpipe, contacts located on opposite sides of Snlil contnct lever, and anexpansion our located in unld pipe and connected with the inner end ofsaid contact lever, suhstnntlnlly as described. 1

8. in a safety device for imaierm the combination, with the outlet pipeof tile hunter, of a. contnct lever,.n coninct locntcd in the (anti)thereof, an expansion hur locri' ad in the pipe nnd cenuected at one endwith the contact "cc-r, and means for shifting the other end oi snldexpnnslon our to vary the distance between the contact lever and no!inch-substantially as described.

9. In a safety device {or heaters, the combinntion. with the outlet pipeof the heater, of a contact ercr. n contact Jocnted in the path thereof,an expansion lmr located in the pipe illlil connected at one end withthe ('untnct lever. means for shifting the other end of said expansionimr to vury the distance between the contact lever and centnct,

and nu llilllct ting mechanism opcrntint; in unluou wizh said lever,suhatnntinlly ns described.

10. In n nnietydevlce {or hentcrs, the cnmnlnuriun. with the outlet pipeof the beater, oi u cuntucl lever, contacts located on oppouilc sidesthereof, no expansion lmr located within the line and connected ni. our:end with the contact lcver nnd menus (or uhllllm; the otLrr end or mildexpansion bar to vnry the position of snld lever relatively to thecuntncts, substantially nn described. I

11. in 1). safety device for hcutcrs, the comblnntlon, with the milletpipe of the heater. of u cnntnct lever plvolnily mounted nn snld pipeand extending ncrusu tin: sumo. at contact in the pntli or said lever, uawroiv'silutft mounted to rotate in suit] pipe. and on cx-pnnsion lllllhurln r n tin-ended engutzunmnt with the screw admit. at one end, its

other end bclnc' connected with the c'ontuct lever, SillJSllllltlally usdcucrlired.

' 12. A nn'ieii' device tor heaters, comprising n gun Supplyth-zrrnoutnr'controlled in the temrwrutuic or the heater and acting tornove mild circuit cloulognrm against one-or the other of puldcontnctnas the tcmpcrziture either rlups i itails exceualvely, iuimtantlnlly rmdescribed.

lilo

In Safety devifie heaters, 61 g pp y P p 8 one direction or the otherupon an undue increase or de- [0 SKOMOCK controlling the some andprovided with a cross crease in the temperature, substantially asdescribed. head, a weighted lever pivotzilly mounted on the cross y 1,tcstimgny h f, I afiix my signature in presence of head, ahntmentsdifferentially located on opposite sides of t it 5 said cross head,whereby the cross head is moved to different extents according as thelever falls in one direction or IRA FILSON' the other and strikes one orthe other of said abutments, Witnesses: means for holding said levernormally in upright position, H. L. HAMMAKER, and means for releasingsaid lever to cause it to fall in IRVINE MILLER.

i l i i

